| 摘要 |
<p>PURPOSE: To perform a foaming process quickly, uniformly, and with less heat emission by installing an electric charge accumulator in a position confronting one of the element electrodes with a dielectric substance interposed, allowing the accumulator to make discharge, and therewith forming an electron emission part in an electroconductive film. CONSTITUTION: A changeover switch 404 is closed so that a power supply 401 is connected with one 4 of the element electrodes. Because a base board 1 of dielectric substance is interposed between an electroconductive body 405 and the element electrodes 4, 5 and an electroconductive thin film 3, positive electric charges are produced at the surfaces of the electrodes 4, 5, and charges are accumulated in capacitance components 402, 403. Then the changeover switch 404 is turned so that the electrode 4 and electroconductive body 405 are connected together. Thereby the electric charges accumulated in the electrode 4 are released directly through a shortcircuit, while the electric charges accumulated in the electrode 5 are discharged through the thin film 3, in which Joule's heat is produced and foaming takes place. Thus an electron emission part 2 is formed. According to these procedures, the foaming process can be ended quickly through a single cycle of operations.</p> |
